initmain

1 files changed, 312 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..ad92978
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,312 @@
+#include <bcd.h>
+#include <gb/gb.h>
+#include <rand.h>
+#include <stdbool.h>
+
+#include "backgrounds/background.h"
+#include "backgrounds/game_over.h"
+#include "backgrounds/game_over_map.h"
+#include "backgrounds/map.h"
+#include "backgrounds/numerals.h"
+#include "defines.h"
+#include "metasprite.h"
+#include "pipe.h"
+#include "sprites/bird.h"
+#include "sprites/button.h"
+#include "sprites/pipe.h"
+
+UINT8 g_background_position = 0;
+UINT8 g_foreground_position = 0;
+BCD g_player_score = 0;
+BCD g_player_high_score = 0;
+UINT8 g_foreground_scroll_speed = FOREGROUND_SCROLL_SPEED;
+Metasprite g_bird = {
+    .x = 30,
+    .y = 70,
+    .width = BIRD_WIDTH,
+    .height = BIRD_HEIGHT,
+    .velocity_x = 0,
+    .velocity_y = 0,
+    .sprite_ids = {0, 1, 2, 3},
+    .tile_ids = {0, 1, 2, 3},
+};
+
+Metasprite g_button = {.x = 80,
+                       .y = 68,
+                       .width = 16,
+                       .height = 16,
+                       .velocity_x = 0,
+                       .velocity_y = 0,
+                       .sprite_ids = {4, 5, 6, 7},
+                       .tile_ids = {BUTTON_TILE_START, BUTTON_TILE_START + 1,
+                                    BUTTON_TILE_START + 2,
+                                    BUTTON_TILE_START + 3}};
+
+void on_hbl_interrupt() {
+  switch (LYC_REG) {
+  case 0x00:
+    move_bkg(g_background_position, 0);
+    LYC_REG = 0x78;
+    break;
+  case 0x78:
+    move_bkg(g_foreground_position, 0);
+    LYC_REG = 0x00;
+    break;
+  }
+}
+
+static inline void wait_frames(UINT8 frames) {
+  static UINT8 wait_counter = 0;
+  for (wait_counter = frames; wait_counter != 0; wait_counter--) {
+    wait_vbl_done();
+  }
+}
+
+inline void wait_for_button_press(UINT8 mask) {
+  while (!(joypad() & mask)) {
+    wait_vbl_done();
+  }
+}
+
+static inline void display_score() {
+  static UINT8 text_buffer[9];
+  bcd2text(&g_player_score, NUMERALS_TILE_START, text_buffer);
+  static UINT8 count;
+  for (count = 0; count < 7; count++) {
+    if (text_buffer[count] == NUMERALS_TILE_START) {
+      text_buffer[count] = NUMERALS_TILE_START + 10;
+    } else {
+      break;
+    }
+  }
+  move_win(WINDOW_CENTERING_OFFSET + (((7 - count) * TILE_SIZE) / 2), 133);
+  set_win_tiles(0, 0, 8, 1, text_buffer);
+}
+
+static inline void update_bird_animation_state() {
+  static UINT8 current_animation_frame = 0;
+  switch (current_animation_frame) {
+  case 0:
+    g_bird.tile_ids[0] = 0;
+    g_bird.tile_ids[1] = 1;
+    current_animation_frame = 1;
+    break;
+  case 1:
+    g_bird.tile_ids[0] = 4;
+    g_bird.tile_ids[1] = 5;
+    current_animation_frame = 2;
+    break;
+  case 2:
+    g_bird.tile_ids[0] = 6;
+    g_bird.tile_ids[1] = 7;
+    current_animation_frame = 0;
+    break;
+  }
+  metasprite_update_tiles(&g_bird);
+}
+
+static inline void update_button_animation_state() {
+  static UINT8 current_animation_frame = 0;
+  switch (current_animation_frame) {
+  case 0:
+    g_button.tile_ids[0] = BUTTON_TILE_START + 4;
+    g_button.tile_ids[1] = BUTTON_TILE_START + 5;
+    g_button.tile_ids[2] = BUTTON_TILE_START + 6;
+    g_button.tile_ids[3] = BUTTON_TILE_START + 7;
+    current_animation_frame = 1;
+    break;
+  case 1:
+    g_button.tile_ids[0] = BUTTON_TILE_START;
+    g_button.tile_ids[1] = BUTTON_TILE_START + 1;
+    g_button.tile_ids[2] = BUTTON_TILE_START + 2;
+    g_button.tile_ids[3] = BUTTON_TILE_START + 3;
+    current_animation_frame = 0;
+    break;
+  }
+  metasprite_update_tiles(&g_button);
+}
+
+inline void play_death_flash() {
+  BGP_REG = 0x90;
+  OBP0_REG = 0x90;
+  wait_frames(3);
+  BGP_REG = 0x40;
+  OBP0_REG = 0x40;
+  wait_frames(3);
+  BGP_REG = 0x00;
+  OBP0_REG = 0x00;
+  wait_frames(3);
+  BGP_REG = 0x40;
+  OBP0_REG = 0x40;
+  wait_frames(3);
+  BGP_REG = 0x90;
+  OBP0_REG = 0x90;
+  wait_frames(3);
+  BGP_REG = 0xE4;
+  OBP0_REG = 0xE4;
+}
+
+inline void play_jump_sound() {
+  NR10_REG = 0x16;
+  NR11_REG = 0x40;
+  NR12_REG = 0x73;
+  NR13_REG = 0x00;
+  NR14_REG = 0xC3;
+}
+
+void main(void) {
+  // Init sound
+  NR52_REG = 0x80;
+  NR50_REG = 0x77;
+  NR51_REG = 0xFF;
+  // Load Background
+  set_bkg_data(0, 10, BG_TILE_DATA);
+  set_bkg_data(NUMERALS_TILE_START, NUMERALS_TILE_START + 10,
+               NUMERALS_TILE_DATA);
+  set_bkg_data(GAME_OVER_TILE_START, GAME_OVER_TILE_START + 10,
+               GAME_OVER_TILE_DATA);
+  set_bkg_tiles(0, 0, BG_TILE_MAPWidth, BG_TILE_MAPHeight, BG_TILE_MAP);
+  // Load tiles into VRAM
+  set_sprite_data(0, 8, BIRD_TILE_DATA);
+  set_sprite_data(PIPE_TILE_START, PIPE_TILE_START + 4, PIPE_TILE_DATA);
+  set_sprite_data(BUTTON_TILE_START, BUTTON_TILE_START + 7, BUTTON_TILE_DATA);
+
+  STAT_REG = 0x45; // Enable H-Blank Interrupt
+  LYC_REG = 0x00;
+
+  disable_interrupts();
+  add_LCD(on_hbl_interrupt);
+  enable_interrupts();
+
+  set_interrupts(VBL_IFLAG | LCD_IFLAG);
+
+  metasprite_init(&g_bird);
+
+  SHOW_BKG;
+  SHOW_SPRITES;
+  SHOW_WIN;
+  DISPLAY_ON;
+
+  while (true) {
+
+    metasprite_move_to(&g_bird, 30, 70);
+    set_win_tiles(0, 0, 20, 2, NUMERALS_TILE_MAP);
+    g_player_score = 0;
+    display_score();
+    metasprite_init(&g_button);
+
+    static UINT8 last_button_state;
+    static UINT8 button_state;
+    static UINT8 frame_count = 0;
+    while (true) {
+      button_state = joypad();
+      if (button_state & J_A) {
+        play_jump_sound();
+        metasprite_jump(&g_bird);
+        last_button_state = button_state;
+        break;
+      }
+      if (frame_count % CYCLE_ANIMATION_N_FRAMES == 0) {
+        update_bird_animation_state();
+      }
+      if (frame_count % CYCLE_BUTTON_N_FRAMES == 0) {
+        update_button_animation_state();
+      }
+      frame_count += 1;
+      g_background_position += BACKGROUND_SCROLL_SPEED;
+      g_foreground_position += g_foreground_scroll_speed;
+      wait_vbl_done();
+    }
+
+    initrand(DIV_REG);
+
+    static Pipe pipe;
+    pipe.x = 200;
+    pipe.gap_skip = 8;
+    for (UINT8 i = 0; i < 36; i++) {
+      pipe.sprite_ids[i] = i + 4;
+    }
+    pipe_init(&pipe);
+    pipe_move_gap_height(&pipe, 2 + (((UINT8)rand()) % (15 - pipe.gap_skip)));
+
+    while (true) {
+      pipe_scroll_horizontal(&pipe, -1 * g_foreground_scroll_speed);
+      if (pipe.x == 0xF0) {
+        static const BCD score_per_pipe = 1;
+        static BCD *const spp_ref = &score_per_pipe;
+
+        bcd_add(&g_player_score, spp_ref);
+        display_score();
+        switch (g_player_score) {
+        case 0x20:
+          pipe.gap_skip = 7;
+          break;
+        case 0x35:
+          pipe.gap_skip = 6;
+          break;
+        case 0x50:
+          g_foreground_scroll_speed = 3;
+          break;
+        }
+        pipe_move_gap_height(&pipe,
+                             2 + (((UINT8)rand()) % (15 - pipe.gap_skip)));
+        pipe_scroll_horizontal(&pipe, -78);
+      }
+      button_state = joypad();
+      if ((button_state & J_A) && !(last_button_state & J_A)) {
+        play_jump_sound();
+        metasprite_jump(&g_bird);
+      }
+      if (frame_count % APPLY_GRAVITY_N_FRAMES == 0) {
+        metasprite_apply_gravity(&g_bird);
+      }
+      if (frame_count % CYCLE_ANIMATION_N_FRAMES == 0) {
+        update_bird_animation_state();
+      }
+      frame_count += 1;
+      g_background_position += BACKGROUND_SCROLL_SPEED;
+      g_foreground_position += g_foreground_scroll_speed;
+      metasprite_update_position_using_velocity(&g_bird);
+      if (g_bird.y < 0x05) {
+        g_bird.y = 0x05;
+        g_bird.velocity_y = 0x00;
+      }
+      if (g_bird.y + g_bird.height > 0x85) {
+        break;
+      }
+      if (g_bird.x > (pipe.x - g_bird.width) &&
+          g_bird.x < pipe.x + PIPE_WIDTH) {
+        if (g_bird.y < ((pipe.height_of_gap + 1) * TILE_SIZE) ||
+            g_bird.y + g_bird.height > ((pipe.height_of_gap * TILE_SIZE) +
+                                        (pipe.gap_skip * TILE_SIZE))) {
+          break;
+        }
+      }
+      last_button_state = button_state;
+      wait_vbl_done();
+    }
+    play_death_flash();
+    pipe_hide(&pipe);
+    metasprite_hide(&g_bird);
+    set_sprite_prop(g_button.sprite_ids[0], 0);
+    set_sprite_prop(g_button.sprite_ids[1], 0);
+    set_sprite_prop(g_button.sprite_ids[2], 0);
+    set_sprite_prop(g_button.sprite_ids[3], 0);
+    g_foreground_scroll_speed = FOREGROUND_SCROLL_SPEED;
+    if (g_player_score > g_player_high_score) {
+      g_player_high_score = g_player_score;
+    }
+    static UINT8 score_buffer[9];
+    static UINT8 high_score_buffer[9];
+    bcd2text(&g_player_score, NUMERALS_TILE_START, score_buffer);
+    bcd2text(&g_player_high_score, NUMERALS_TILE_START, high_score_buffer);
+    BGP_REG = 0xC0;
+    set_win_tiles(0, 0, 20, 2, NUMERALS_TILE_CLEAR);
+    set_win_tiles(6, 4, GAME_OVER_MAPWidth, GAME_OVER_MAPHeight, GAME_OVER_MAP);
+    set_win_tiles(6, 8, 8, 1, score_buffer);
+    set_win_tiles(6, 12, 8, 1, high_score_buffer);
+    move_win(0, 0);
+    wait_frames(180);
+    BGP_REG = 0xE4;
+  }
+}